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another high boost N54 engine failure
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10-08-2010, 12:53 PM | #331 | |
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As a side note, GIAC is not peddling around with el-cheap-o cars like the JDMs, Honda and Toyotas. These guys have been tuning Audi, Porsche, BMW and even Bentleys for over a decade. Does anyone honestly believe here that GIAC will release a tune that does not include a timing remap as part of it's software and risk massively expensive engines in the above mentioned brands? I am not saying that their software is safe to run with METH because I have not data to prove or disprove such a claim. On the other hand, it seems to me that with the rate at which Procede is improving (quite commendable actually) this thing will become a true standalone some day.
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10-08-2010, 12:56 PM | #332 |
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Mike,
I haven't read this thread end to end LOL it’s too long. But it seems that we have had two engines blow up using JB3 and none using Procede? Granted it's debatable as to whether it was the JB3 or not.......... So my question is that if we were to fast forward a year from now and these numbers looked like this... JB3 6 engines failures, Procede 1. At this point would BMS acknowledge a problem? If not at what number would they? I would ask the same of Shiv or GIAC if their product was under this scrutiny. This is a fair question. Last edited by packinDSS; 10-08-2010 at 01:02 PM.. |
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10-08-2010, 12:59 PM | #333 | |
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10-08-2010, 01:10 PM | #334 | |||
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Cylinder pressure has many other factors, the #pounds of boost is somewhat insignificant. Ignition timing, IAT, barometric pressure, altitude, etc are all influences...timing especially. And since I'm quite sure that 20psi is at or past the choke point of the compressor maps on our turbos...it just seems silly and pointless, to be completely honest. The increase in CFM output undoubtedly is experiencing diminished gains per pound as we get higher and higher in psi...while increasing IATs (yes, even with meth), and pumping losses (that 20psi isn't just created by the compressor side of the equation...) Basically, timing, the big thing everyone is harping on here...is one of the most relevant discussions that we could possibly have when talking about cylinder pressures.
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10-08-2010, 01:13 PM | #335 |
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Bms has aknowledge the problem and advising high boosters to lower it and log timings.
Me? I am pushing shit loads of power on v4 and preatty confident autotune will Find the perfect spot.
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10-08-2010, 01:38 PM | #336 | ||
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In all seriousness, the remapping of tables is good, dont disagree. edit - But if the procede like I just said, comes with its own offsets built in, its just a DIFFERENT way of doing the samething, which is reducing ignition at the starting point. Its like taking a 757 vs a 777 plane to the same destination, does either of them get anywhere any quicker? no. Last edited by Jeff@TopGearSolutions; 10-08-2010 at 02:37 PM.. |
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10-08-2010, 01:39 PM | #337 | |
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Please don't take this as an attack. If the JB3 really does this, it would be good to know and would stop a lot of these back and forth jabs. I get the feeling from your comments that you're confusing autotuning as a safetly measure with meth flow map switching in this scenario. In the case of a meth failure, the idea is that the loss of meth flow triggers the PROcede to reduce timing immediately via CPS offsetting, not knock as interpreted from the DME. |
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10-08-2010, 01:45 PM | #338 | |
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10-08-2010, 01:58 PM | #339 | |
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I can see the point you are trying to make. Your autotune ignition correction increased from 0% to around 3% even though you were not experiencing any knock events according to your timing curve. So there must be something proactive going on in the background. Might be a bit of that hidden background correction that Shiv mentioned earlier But 3% ignition correction is next to nothing.......maybe 2/10th's of one degree of advance if that. There is no doubt in my mind that if you have any active ignition correction going on, then you have some proactive timing retard occuring. At 30% ignition correction on my car, I see about 1 degree of retard at mid rpm's. But with zero ignition correction, you have just that......no active timing being subtracted. I think the only way Procede is going to know if it needs to introduce substantial timing correction is if the knock sensors indicate a need for the DME to drop timing. So to summarize..... If you are running 100% ignition correction and have autotune turned off.....Procede will proactively always be reducing your timing advance by 4-6degrees in order to Prevent the occurence of a knock event. If you have zero ignition correction and autotune turned on......then Procede will reactively increase your ignition correction automatically to a safer level. But I believe the trigger for this mechanism to take place is the occurence of knock events in the first place. So in that sense it is after the fact......not before. |
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10-08-2010, 02:03 PM | #340 | |
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10-08-2010, 02:06 PM | #341 |
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Defactom6: when you reflash and make a tune
You adjust ALL tables. This means the dme is full aware of the boost pushed,timing etc and can take the preventive measures necessary to avoid knocking hard. This is the basic of a well done flash.
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10-08-2010, 02:13 PM | #342 |
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There are no engines that blew up with procede v3 and v4 . Sorry but this is pissing me off... Get a hold of your customers and tell them to run the preset maps up to 7 to avoid more failures till maybe jb4 comes out.
Not everybody has 10k to shed for the fun of it or because apparently the meth kit stopped working.... I am just trying to save some money from other people...
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10-08-2010, 02:14 PM | #343 | |
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We know the 2 JB3 guys and exactly what the repair will cost but it's so fuzzy about the 2 Procede failures. Can you provide evidence? Thanks
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10-08-2010, 02:16 PM | #344 | |
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I guess for me the question is whether it is considered in the realm of "still safe" to allow for a single drop of 3 degrees in the timing curve with a subsequent recovery and rise....... Or should I tune for zero knock events alltogether and leave some power on the table? |
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10-08-2010, 02:17 PM | #345 | |
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10-08-2010, 02:29 PM | #346 | |
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HPF has done a fine job with this on the M3 Turbo setup and their piggyback/meth/race setting. One customer blew an engine. HPF on their dime took the car, tore the engine down, did a complete analysis and posted it on the forums for all to see. The verdict, the customer doing a self install screwed up the Meth install and it wasn't working properly. The owner bought a local hardware store piece to replace a missing one in the puzzle. This actually led to the failure of the meth not working properly and the engine imploding. Props to HPF because they helped the guy out, got the engine rebuilt and he went Stage 3 after that fiasco and did a fantastic breakdown and analysis. They knew if you installed and ran the car exactly as they designed/tuned it, it is basically impossible to hurt the engine. This attitude that you can do what you want as a customer at your own risk doesn't sit well with me. If the customer's were so smart and knew all the risk, they would be doing their own tunes, and JB/Procede/GIAC wouldn't be around. Just my two cents.
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10-08-2010, 02:38 PM | #347 | |
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10-08-2010, 02:43 PM | #348 | |
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When you start adding in IC% what it really means is its a weight of what % of those templates to be using, given all the other conditions. Its a little complex, and im sure shiv can explain it better, but the important thing is there is a proactive approach. I think you kind of hit on that... just tried to clarify it for others. |
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10-08-2010, 02:48 PM | #349 |
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The real safety the Procede affords is not running full aggression (high boost, full timing) UNTIL methanol is flowing. That's when the engine is more likely to detonate as it transitions from no boost to full boost. And with methanol flow always lagging behind .5-1 second, it's also the time that an engine is most likely to ping.
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10-08-2010, 02:48 PM | #350 | |
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This is really just off topic conjecture. The bottom line with the Procede's autotuning is that it takes many variables into account when determining the amount of timing and fuel correction, as well as boost. A broad overview of what it takes into account can be found in other threads. The exact nature of how it tunes and compensates for these variables is how Shiv and crew take money home at the end of the day. Yes, autotuning reacts based on knock. But saying that the only thing that autotune works on is knock is patently absurd. There are many variables which it takes into account, which all tally up to a system that is supposed to avoid coming close to that point. The JB3 does not do any of this right now. That is a fact. There will be a BMS system which does this in the future. But in the here and now, there is no BMS system which does this. The BMS crew can point fingers at the Shiv crew and say "look at guys running meth on procedes with 0 IC" all they want...the bottom line is, until there is evidence documenting the conditions under which Sevak's car was running, that is an apples to oranges comparison. The Procede cars with 0 IC have a system that actively monitors elemental variables, and determined that it is safe to run 0 IC under those conditions without approaching the knock threshold. The JB3 lives in a vacuum world where it is oblivious to conditions. When spraying enough meth at low enough boost levels in the right conditions, this may or may not be enough to keep the stock ECU satisfied IN THAT MOMENT. That is up to the end user to decide for him or herself. In Sevak's case, it clearly wasn't.
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10-08-2010, 02:49 PM | #351 | |
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10-08-2010, 02:52 PM | #352 | |
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well said!
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